from CAST, Inc.
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Features
- Enables/disables control of individual direct memory access (DMA) requests
- Contains four independent DMA channels
- Allows for independent auto-initialization of all channels
- Allows memory-to-memory transfers
- Allows memory block initialization
- Allows for incrementing or decrementing addresses
- Expands to any number of channels
- Contains an End of Process input for terminating transfers
- Accepts software DMA requests
- Has independent polarity control for
DREQandDACKsignals C8237controller was developed in HDL and synthesizes to approximately 6,900 gates depending on the technology used- Functionality based on the Intel 8237
Block Diagram
Figure 1 shows the block diagram for the C8237 Programmable DMA Controller.
| Figure 1. C8237 Programmable DMA Controller Block Diagram |
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Description
The C8237 programmable DMA controller core is a peripheral interface circuit for microprocessor systems. The core is designed to be used in conjunction with an external 8-bit address latch. It contains four independent channels and may be expanded to any number of channels by cascading additional controller chips. Each channel has a full 64-K address and word count capability.
Device Utilization Example
Table 1 lists the typical device utilization results for the megafunction.
| Table 1. Typical Device Utilization | |||||
| Device | Speed Grade | Utilization | Performance (fMAX) |
Parameter Setting | |
|---|---|---|---|---|---|
| Logic Elements (LEs) (1) |
EABs (2) |
||||
| Stratix II EP2S60 | -3 | 816 | - | 140 MHz | Contact CAST |
| Stratix® EP1S20 | -5 | 1,007 | - | 94 MHz | Contact CAST |
| Cyclone™ EP1C20 | -6 | 1,007 | - | 97 MHz | Contact CAST |
| FLEX® 10K EPF10K30A | -1 | 1,121 | - | 17 MHz | Contact CAST |
| FLEX 10K EPF10K100B | -1 | 1,128 | - | 17 MHz | Contact CAST |
| FLEX 10K EPF10K30E | -1 | 1,121 | - | 27 MHz | Contact CAST |
| ACEX® EP1K30 | -1 | 1,121 | - | 28 MHz | Contact CAST |
| APEX™ 20K EP20K60E | -1 | 1,011 | - | 39 MHz | Contact CAST |
- LE = Logic Element. The LE count for Stratix II devices is based on the number of adaptive look-up tables (ALUTs) used for the design as reported by the Quartus® II software.
- EABs = Embedded Array Blocks
Contact Information
For additional information, contact CAST, Inc. at:
CAST, Inc.
11 Stonewall Court
Woodcliff Lake, NJ 07677, USA
Phone: +1 (845) 353-6160
Fax: +1 (845) 727-7607
E-mail: OpenCore@cast-inc.com
URL: www.cast-inc.com
